Stair construction



June I7-, 1930..) A, E, SHLAGER ET AL 1,764,698

STAIR CONSTRUCTION l, Filed April 11. 1929 i) "un-"- Patented June 17, 1930 Umro STATESVPATQNT OFFICE.

M ABRAHAM n. SHLAGER. Louis sHLAGEnANn BENNETT' M. Gnoissnn, orV BOSTON,

`ivressnonusn'"r'rs j stare. oonsrnuorron Appubauonfmedlaprn 11, 1929. .seriali-No. s543404.

This invention relates to improvements in stair constructiomand has, for its object to provide a stair construction of-strongk and rigid-constructonwhich may be easily and 5. quickly assembled and which will be entire, ly ireproof.

` The invention consists in a stair construction as set Aforth in the following specification and particularly as pointed out in the mfclaims thereof.

Referring to the drawings:

Figure lrepresents a plan View of a seotion of a staircase embodying our invention.

Fig. 2 is a vertical section taken on the 15j line 2-2 of Fig. 1.

Fig. 3 is a vertical transverse section taken on the line 3-3 of Fig. 1. Fig.`4 is a detail section taken on the line 4-4 of Fig. 3.`

Fig. 5 is an enlarged side elevation of a portion of one of the stringers illustrating the method of interlocking a tie bolt with the stringer.

Fig. 6 is a view similar to Fig. 5 illustrat-V 25ing anotherr method of interlocking a tie bolt with a Stringer.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, referring to Figs. 1 to 5 inclusive, 10 and 11 represent the side stringere of a staircase, ther Stringer' 10 being located adjacent to the side wall. 12 of a building and the stringer 11 being located upon theopposite side ofthe staircase from the stringer 10. The stringere 10 and 11 are preferably of channel construction, and rigidly secured thereto upon their. under sides are narrow plates 13 which are preferably welded to the lower flange of the channel. The plates 13 extend beyond the closed side of the channel, thereby in effect forming a 'l' at the lower side of the channel. The purpose of the plates 13 is to provide a flange for the closed side of the chan- 1 nel which will have parallelv upper and lower sides, it being impossible Vto Obtain any standard channels or angles that have flanges with parallel,V sides and that do not have fillets where the flange joins the main portion of the channel.

Extending' between the stringere 1-0 and` 11 and resting upon and having close contact with the entire upper surface of the portion of the plates 13; that project from` the stringers is a treadsupport 14. The tread support 14 is constructed of sheet metal and` is secured to the` plates lgby bolts 15 andthe opposite side edges of the" tread support abut" against the inner face of each of the stringers;

The tread supports 14 aire bent upwardly at `16 to `form the front edge of the `tready portion of the stairs and the upwardly bent? portion 16'is bent rearwardly at 17 in order to reinforce the upper front corner of the` tread portion. The tread support 14 at the rear thereof is bent upwardly at18 to form the riser for the stairs and the upper por-` tion of the riser is bent rearwardly at 19` to form aflange which is bolted to the adjacent tread support 14 by bolts 20. v

In addition to being secured' together by the tread support 14,- the stringcrs 10 and 11 are" tied together by means of bolts 21 which extendfthrough and betweeny saidf stringers above the horizontal? portion of the tread support 14 below the level of the flange 17.` In orderv that the bolts 21 may cient amountA to permit theopposite end of the. bolt to lie-inserted through a hole provided therefor inthe Stringer 11 the -bolt is rotated one quarter of a turn in order that thehead portion 22 will interlock with the Stringer 10 as illustrated inFig. 5, after which a nut 24 is applied tothe end of the bolt that projects through the stringer 11. After the bolts 21 are in position, concrete or anyother suitable form of a temporary plastic material 25 is placed uponthe tread support 14 to form the tread portion ofthe stairs and the uppersurface of the tread' portion is flush with .the upper surface of the fiange 17. The concrete or other material 25 flows around the rods 21 and after the material is set, the rods act to hold said material firmly in position upon the tread support.

By securing the plates 13 to the under sides of the channels 10 and 11, it is possible to secure the tread supports 14 to the plates 13 with the under surface of the tread support contacting directly with the upper surface of the plates 13 as illustrated in; Fig. 4 and at the same time the absence of Ya fillet where the upper surface of the plate 13 intersects the closed side of the channel makes it possible for-the opposite edges of the tread support to abut against the` adjacent face ofthestringer, giving Lattight joint v lthat .will hold the concrete, or other plastic material, when the same Vthe tread support.

By" providing the slots in the Stringer 10, itis possible to insert the bolts 21 in the stringers from ya position between said stringers after the latter. have been placed in position, and after the-bolts are in their inal positions thestringers 10 and 11 are tied directly together, the material 25 is prevented from lifting and the bolts are, in turn, prevented from moving in the slots by the material 25. t Y

11i-Fig. 6 we have illustrated another form of slot 26 that may be provided in the stringer 10. This slot has an enlarged portion' 27 through which the ordinary head 28 of a standard form of bolt 29 may be inserted, after which the-boltmay be moved laterally thereof into a narrow portion 30 of the slot. By providing this form of slot, the bolt 29 may be inserted in the stringers 10 and 11 in exactly the same manner as the bolts 21 previously described, and it is not necessary to provide a special head for the bolt as is the case where the 'slot' is formed as illustrated in Fig. 5.

117e claim: t

1. A stair construction having, in combination, a-pair of side stringers, a sheet metal tread support mounted upon said stringers and extending therebetween, bolts extending through and between the stringers 'above the tread support and spacedA is poured upon ysaid stringers having slots provided there? in, a sheet metal treadl support mounted upon said stringers and extending therebetween, bolts extending through and between the stringers above the tread support and having head portions insertable through said slots, and a tread portion of concrete upon the tread. support and surrounding said bolts.

In testimony whereof we have hereunto set our hands.

ABRAHAM E. SHLAGER. LOUISV SHLAGER. f BENNETT M. GROISSER.

apart from the surfaces of the latter and tying the stringers together, and` a temporarily plastic material upon said tread support and` surrounding said bolts-and constituting the tread portion of the stairs;

2. A stair construction having, in com-v bination, a pair of side stringers, a plate fastenedto the under` side of each Stringer,

.a sheet metal'tread support fastened to and restingupon the upper surface of zsaid plates with its opposite edges abutting against the adjacent face of both of said stringers, bolts extendingthrough Vand be- 

